Constraint ignores uncommitted rows?

I have a fairly simple transaction. I turn off autocommit, insert a record, then insert another record with a constraint that an FK in the second record reference the first record (its PK).
This transaction fails with ORA-02291: integrity constraint (FOO.BAR) violated - parent key not found
The insert was performed, and the key values are correct. All I can conclude is that the constraint is not seeing the uncommitted insert.
Isolation level is 1 (TRANSACTION_READ_UNCOMMITTED)
Access class is IBM's DatastoreJDBC running over Oracle's thin JDBC client, talking to Oracle 7.3?
I find it hard to believe that this is working as designed, unless there's some way to do nested transactions that I'm not aware of?
null

no takers?
Does Oracle participate here?

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